A group of NFL owners will be deposed and asked to turn over records in relation to the Colin Kaepernick collusion case, reports say.

ESPN's Adam Schefter said Dallas' Jerry Jones, New England's Robert Kraft and Houston's Bob McNair are among the owners who will be asked to turn over cell phone records and emails. ABC News adds Seattle's Paul Allen and San Francisco's Jed York.

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Colin Kaepernick, a former Super Bowl-starting quarterback with the 49ers, filed the collusion grievance against the NFL and owners as he has struggled to find a job since he sparked league-wide protests during the national anthem. The filing demands an arbitration hearing on the matter.

Kapernick's attorney, Los Angeles-based Mark J. Geragos, said Kaepernick filed the grievance "only after pursuing every possible avenue with all NFL teams and their executives."

Experts say collusion cases are difficult to prove. Owners' records could be the best chance to find that proof.

"There has to be some evidence of an agreement between multiple teams not to sign a player," Gabriel Feldman, the director of the sports law program at Tulane University, told The Washington Post. "Disagreement over personnel decisions, as obvious as it may seem to someone looking at this, does not provide evidence of collusion. There has to be some evidence of an explicit or implied agreement. There has to be proof of a conspiracy."